Self- supported high-entropy alloy electrocatalyst for highly efficient H2 evolution in acid condition

Ma, Pei-yan; Zhao, Mingming; Zhang, Long; Wang, Heng; Gu, Junfeng; Sun, Yizhen; Ji, Wei; Fu, Zhengyi

doi:10.1016/j.jmat.2020.06.001

Cited by 53 publications

(23 citation statements)

References 33 publications

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“…The elementary diversity and unique structure of HEAs helps to design catalytic materials with non or less precious metal input and superior stability. Combining the catalytic property of Co, Fe, Ni, and the corrosion-resistant ability of Cr and Al, CoCrFeNiAl HEA electrocatalyst was designed and prepared by mechanical alloying and SPS [243]. The abundant metal hydroxide/oxide groups formed after electrochemical activation on HEA and large electrochemical surface area (ECSA) benefiting from highly dispersed active sites and severe lattice distortion characters of HEMs, enabled the CoCrFeNiAl outstanding HER activity in 0.5 M H 2 SO 4 solution with an overpotential of 73 mV at the current density of 10 mA•cm -2 and a Tafel slope of 39.7 mV•dec -1 .…”

Section: Water Splittingmentioning

confidence: 99%

High-entropy ceramics: Present status, challenges, and a look forward

et al. 2021

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High-entropy ceramics (HECs) are solid solutions of inorganic compounds with one or more Wyckoff sites shared by equal or near-equal atomic ratios of multi-principal elements. Although in the infant stage, the emerging of this new family of materials has brought new opportunities for material design and property tailoring. Distinct from metals, the diversity in crystal structure and electronic structure of ceramics provides huge space for properties tuning through band structure engineering and phonon engineering. Aside from strengthening, hardening, and low thermal conductivity that have already been found in high-entropy alloys, new properties like colossal dielectric constant, super ionic conductivity, severe anisotropic thermal expansion coefficient, strong electromagnetic wave absorption, etc., have been discovered in HECs. As a response to the rapid development in this nascent field, this article gives a comprehensive review on the structure features, theoretical methods for stability and property prediction, processing routes, novel properties, and prospective applications of HECs. The challenges on processing, characterization, and property predictions are also emphasized. Finally, future directions for new material exploration, novel processing, fundamental understanding, in-depth characterization, and database assessments are given.

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Section: Water Splittingmentioning

confidence: 99%

High-entropy ceramics: Present status, challenges, and a look forward

et al. 2021

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“…Alloying 3d base metals, including Co, Cr, Fe, and Ni, with Pt has been studied as a way to reduce the use of Pt and enhance its activity in low-temperature fuel cells, but the presence of Pt remains indispensable to desired functionality. − Related alloys (e.g., Ni–Co, Ni–Fe–Mo–Co–Cr, and Co–Cr–Fe–Ni–Al) have been tested for hydrogen evolution reaction (HER) without fundamental insights into the chemical origin of their activity. Here, we predict, through a theoretical analysis of the surface reactivity of this HEA using an approximate surface model , instead of a parameterization approach, ,,, that one particular HEA, CoCrFeNi, shows activity for the electrochemical HER that is closer to that of Pt than all of the individual component metals.…”

Section: Introductionmentioning

confidence: 99%

CoCrFeNi High-Entropy Alloy as an Enhanced Hydrogen Evolution Catalyst in an Acidic Solution

et al. 2021

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High-entropy alloys (HEAs) have intriguing material properties, but their potential as catalysts has not been widely explored. Based on a concise theoretical model, we predict that the surface of a quaternary HEA of base metals, CoCrFeNi, should go from being nearly fully oxidized except for pure Ni sites when exposed to O 2 to being partially oxidized in an acidic solution under cathodic bias, and that such a partially oxidized surface should be more active for the electrochemical hydrogen evolution reaction (HER) in acidic solutions than all the component metals. These predictions are confirmed by electrochemical and surface science experiments: the Ni in the HEA is found to be most resistant to oxidation, and when deployed in 0.5 M H 2 SO 4 , the HEA exhibits an overpotential of only 60 mV relative to Pt for the HER at a current density of 1 mA/cm 2 .

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“…HEAs are the very first types of high‐entropy materials and also the most widely investigated for the electrochemical water‐splitting application. [ 19–25 ] Because of the high‐entropy effect caused by the lattice distortion and slow diffusion as the number of components increases, HEAs possess distinctive characteristics such as extremely high mechanical strength and corrosion resistance under severe conditions, which are highly suited for electrocatalytic processes. [ 26 ] During the electrocatalysis, alloying can significantly modify the adsorption energy of reaction intermediates on the catalyst surface, thereby improving its catalytic performance.…”

Section: Overview Of High‐entropy Materials For Water Electrolysismentioning

confidence: 99%

High‐Entropy Materials for Water Electrolysis

2022

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Green hydrogen production by renewables‐powered water electrolysis holds the key to energy sustainability and a carbon‐neutral future. The sluggish kinetics of water‐splitting reactions, namely, hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), however, remains a bottleneck to the water electrolysis technology. High‐entropy materials, due to their compositional flexibility, structural stability, and synergy between various elemental components, have recently aroused considerable interest in catalyzing the water‐splitting reactions. Herein, a timely review of the recent achievements is provided in high‐entropy materials for water electrolysis. An overview of different kinds of high‐entropy materials for catalyzing the HER and OER half‐reactions is introduced, followed by a discussion of theoretical and experimental efforts in understanding the fundamental origins of the enhanced catalytic performance observed on high‐entropy catalysts. Various materials design strategies, including control of size and shape, construction of a porous structure, engineering of defect, and formation of hybrid/composite structure, to develop high‐entropy catalysts with improved catalytic performance are highlighted. Finally, the remaining challenges are pointed out and the corresponding perspectives to address these challenges are put forward to promote the development of the research field of high‐entropy water‐splitting catalysts.

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Self- supported high-entropy alloy electrocatalyst for highly efficient H2 evolution in acid condition

Cited by 53 publications

References 33 publications

High-entropy ceramics: Present status, challenges, and a look forward

High-entropy ceramics: Present status, challenges, and a look forward

CoCrFeNi High-Entropy Alloy as an Enhanced Hydrogen Evolution Catalyst in an Acidic Solution

High‐Entropy Materials for Water Electrolysis

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